Kirby Morgan 77 - Manual (Page 13)

53
© Copyright 1970-2008 Kirby Morgan Dive Systems, Inc. All rights reserved. Document #080626002
Kirby Morgan 77
3.8.3 Opening the Breathing Gas Supply
to the Helmet
Prior to turning on the air supply for the helmet,
check to see that the free flow valve is closed and the
regulator adjustment knob is all the way in.
Slowly bring up the gas pressure to the helmet to 150
p.s.i.g. (10.2 bar). Slowly back out on the regulator
adjustment knob until a slight free flow develops,
then turn the adjustment knob in (clockwise) until
the free flow just stops.
To properly check the breathing system you must
completely don the helmet.
3.8.4 Fogging Prevention
A thin film of anti-fogging solution may be applied to
the interior of the polycarbonate face port prior to the
dive to help prevent fogging during the dive. A mild
liquid dish washing detergent, or other commercially
available anti-fogging solutions, may be applied with
a soft rag or paper towel to the interior of the port.
The diver should use a solution which has been
found satisfactory in the past. However, do not use
an aerosol spray on the polycarbonate lens. The
propellants in some aerosol dispensers cause damage
to the lens.
Never use any aero-
sol propelled sprays
near the face port of
the any Kirby Morgan
helmet or band mask.
The propellant used
in these aerosols can
WARNING
invisibly damage the polycarbonate face
port and cause it to shatter upon impact
from any strong blow. If the face port
fails underwater the helmet will flood and
drowning may result.
A thin film of dish soap or other anti-fogging solu-
tion should be applied to the lens prior to the diver
donning the helmet.